Backwater valve



Nov. 9 1926. I 1,606,396

' c. J. BLOM BACKWATER VALVE I/vvE/vToR 1 76- 2 61.1756 JZ BLOM Ir ran N: Ya

Patented Nov. 9,- 1926.

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BAoirwArnn VALVE.

Application filed June 9, 1922. Serial No. 567,138.

My invention relates to sewer connections and the object of the invention is to provide an improved backwater valve which will normally stand open and allow free passage =3 of sewer gas to the stack, but will automatically close when water backs up in the sewer and prevent flooding of the basement through the overflow of the closet bowl.

A further object is to provide a backwater w valve which can be easily and quickly appliedt-o a modern system. of plumbing and be thoroughly eifective for the purpose designed.

In the accompanying drawings forming 1 part of this specification,

Figure 1 is a longitudinal sectional view thru a sewer pipe connection embodying my invention,

Figure 2 is a similar view with a wall of the connection broken away, showing the valve in its closed position.

In the drawing, 2 represents the upper section of the attachment having a flanged end 3 adapted to receive the pipe that leads from the closet bowl or other bathroom connection. This section has a cap or cover at secured by bolts 5 and readily removable to allow access to the valve seat, and the interior of the section. 6 represents the lower section of the connection having an end 7 that is adapted to fit into the flanged end 8 of the pipe that runs to the sewer. The usual packing 9 is interposed between the flange and the end 7 A chamber 10 is provided in :m the section 6 wherein water may back up from the sewer and between this chamber and the upper section is a valve seat 11 having preferably a beveled face 12 adapted to receive the upper curved surface 13 of a hollow float 14:. An ear 15 is provided on this float having a slot 16 therein to receive a pivot pin 17 on which the said float swings vertically to open or close the valve opening. The loose fit of the ear on the pivot pin allows the float to adapt itself to the radius on which it swings and prevent any possibility of its binding or cramping and not seating squarely on the valve seat.

The under surface of the float is prefer ably rounded and I prefer to provide a seat 18 on the inner wall of the section 6, curved to receive the float and support it out of contact with the wall of the section. A plug 19 is provided near the hinge of the float thru which access may be had to the chamber 10 for cleaning or other purposes.

The wall at the closed end of the chamber 10 is rounded to follow the rounded contour of the under or rear side of the float valve when the valve is seated against the abut- Incnt 18. With the valve so positioned the opposite rounded faces of the under side of the valve and the'end wall of the chamber 10 are practically parallel and provide a passage therebetween free from obstructions, except the slight ones offered by the valve hinge and the abutment. Gonsequenta ly, when the pipe connection is flushed, the water can freely flow through the passage and prevent lodgement of refuse therein. Also, the valve in its normally open position offers no obstruction to the downward rush of the flush through the main connection and permits a free upward flow of gas to the stack. Furthermore, when sewer water backs into the chamber 10, the oflset position of the valve from the chamber wall permits a free passage of the water back of and under the valve to effect the closing action.

In case the sewer becomes flooded and water backs up into the chamber 10-, the float will be lifted and swung up against the seat .12 and held there by the force of the water, thereby preventing the sewer water from backing up into the closet bowl or other toilet connection. As soon as the water flows back into the sewer, the float will drop by gravity to the position shown in Figure 1 opening the passage thru the connection and allowing the sewer gas topass freely up to the stack.

1 claim as my invention:

1. A backwater connection and valve comprising an upper horizontal section of pipe having a downwardly turned tubular portion and a lower horizontal section of pipe having an upwardly turned tubular portion merging into said downwardly turned tubular portion, a horizontal valve seat between said tubular portions and a normally pendant float valve hinged in said upwardly turned tubular portion and operable to seat upwardly against said valve seat when water backs into said lower pipe section, said valve having its rear side rounded to follow the contour of the rounded wall of said upwardly turned tubular portion when the valve is in its normal open or pendant position to provide a passage between said wall and the pendant valve.

2. A backwater connection and valve comprising an upper horizontal section of pipe having a downwardly turned tubular portion and a lower horizontal section of pipe having an upwardly turned tubular portion merging into said downwardly turned tubular portion, a horizontal valve seat between said tubular portions, a normally pendant float valve hinged in said upwardly turned tubular portion and operable to seat upwardly against said valve seat when water backs into said lower pipe section, said valve having its rear side rounded to follow the contour of the rounded wall of said upwardly turned tubular portion when the valve is in its normal open or pendant position, and an abutment projecting from the wall of said upwardly turned tubular portion to engage the pendant valve to maintain said valve in spaced relation to the rounded wall of said upwardly turned tubular portion to provide a passage between the valve and wall through the upwardly turned tubular section.

3. The combination, with a housin having a pipe section provided at one end with means for connection with a plumbing fixture and a pipe section at its other end having means for connection with the sewer, a valve seat interposed between said pipe sections, a float loosely hinged in said second pipe section and adapted to be raised by the backwater therein for closing the passage through'said valve seat, said second pipe section having a port in its walls adjacent the hinge of said float and a plug for normally closing said port.

In witness whereof, I have hereunto set my hand this 6th day of June 1922.

' CLAES J. BLOM. 

